well yeah you're talking about tobacco.............a product which has raked in many $ for the companies involved, and their share-holders, ....and caused unknowable numbers of deaths.
But - , this is hard but you can't legislate against people's tendencies, successfully.
We have the juggernauts of death grinding away . ..alcohol and tobacco.. known and proved to cause harm. Still they are legally available, although restricted by law to those 18 and over. And they generate massive revenue to govt. If people want to drink themselves to death .. that is their right. Sad but true.
The absolutely best thing we could do is legalise Pot, and its copies, on the same basis .. and
use those huge freed up resources to police serious crime.Because people will always do what they will, and some things, like the criminalisation of Pot, are unproductive and only serve to bolster crime. never could understand the rationale.!